I'd ditch the DoTs completely. Diseases have always felt more like the Scholar's thing, anyway. Instead, focus on the interaction between the player and the summon. Perhaps make them respond via player action, a la Demi-bahamut, or have our aetherflow abilities directly affect the pet. Just a thought, but perhaps the player could rotate through summons the way a bard rotates through songs, each summon interacting differently with the game.

I know this may be unpopular, but I like the way PvP handles dreadwyrm trance. Your instant-cast ruin III turns into ruin IV, which is twice as powerful but has a short cast time. It really makes you feel powerful, which I prefer over the "mobility" button we have now.

My suggestions here might seem to limit the flexibility and mobility that makes the job popular, but I'd really like to see them nail the job identity and feeling of being powerful that I know the job is capable of.